Png format compression vs. loading time

Comments

• Rickyngk Member

  June 2012

  Oop, there's a dup in http://www.giderosmobile.com/forum/discussion/1225/png-format-compression-vs.-loading-time
  What's wrong? Would you please help me to remove it.
  
  Back to this topic, any ideas

  http://www.guava7.com/

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• Magnusviri Member

  June 2012

  Mobile devices have limited space. If you have so many textures that it is taking that long to load, by switching to raw image files you will end up making your app much bigger. I suppose you would rather have that trade-off, but as a phone user I'd rather have smaller apps. I remove anything over 50MB unless it's something I use often. A Gideros app is already that big because of the Gideros library included in every exported app. I guess you have to decide which path is preferable to you.

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• atilim Maintainer

  June 2012 edited June 2012

  And my prediction is the loading time can be worse. Because usually disk I/O is slower than decompressing on the memory. And png file format supports uncompressed images in an indirect way. It uses zlib internally to compress image data and if you can save the png with compression level 0, then you obtain a uncompressed image.

  http://en.wikipedia.org/wiki/Cytorus

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• Rickyngk Member

  June 2012

  thank atilim, I can't find that option in my image editor tools. I will try wth another and do a comparation.

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• atilim Maintainer

  July 2012

  @Rickyngk I've looked at ImageMagick's quality command line option http://www.imagemagick.org/script/command-line-options.php#quality but it seems it does some other operations other than setting zlib compression level on png files. But it may be worth to try.
  

  Likes: Rickyngk

  http://en.wikipedia.org/wiki/Cytorus

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